This is a steer which has undergone a surgery to create a permanent opening into its rumen. It has been outfitted with an apparatus to collect gases released in the process of digestion. The types and quantities of gases produced by differing diets can be studied. Feed additives can and have been developed to reduce gas production.
Cattle do burp
I wonder where the 26% number of US methane production comes from. PettA??? (People Eating Tasty Animals)

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